
(function($){
var selects=$('select');//获取select
for(var i=0;i<selects.length;i++){
	createSelect(selects[i],i);
}
function createSelect(select_container,index){
	//创建select容器，class为select_box，插入到select标签前
	var tag_select=$('<div></div>');//div相当于select标签
	tag_select.attr('class','select_box');
	tag_select.insertBefore(select_container);
	//显示框class为select_showbox,插入到创建的tag_select中
	var select_showbox=$('<div></div>');//显示框
	select_showbox.css('cursor','pointer').attr('class','select_showbox').appendTo(tag_select);
	//创建option容器，class为select_option，插入到创建的tag_select中
	var ul_option=$('<ul></ul>');//创建option列表
	ul_option.attr('class','select_option');
	ul_option.appendTo(tag_select);
	createOptions(index,ul_option);//创建option
	//点击显示框
	tag_select.toggle(function(){
		ul_option.show();
	},function(){
		ul_option.hide();
	});
	var li_option=ul_option.find('li');
	li_option.on('click',function(){
		$(this).addClass('selected').siblings().removeClass('selected');
		var value=$(this).text();
		select_showbox.text(value);
		ul_option.hide();
	});
	li_option.hover(function(){
		$(this).addClass('hover').siblings().removeClass('hover');
	},function(){
		li_option.removeClass('hover');
	});
}
function createOptions(index,ul_list){
	//获取被选中的元素并将其值赋值到显示框中
	var options=selects.eq(index).find('option'),
		selected_option=options.filter(':selected'),
		selected_index=selected_option.index(),
		showbox=ul_list.prev();
		showbox.text(selected_option.text());
	//为每个option建立个li并赋值
	for(var n=0;n<options.length;n++){
		var tag_option=$('<li></li>'),//li相当于option
			txt_option=options.eq(n).text();
		tag_option.text(txt_option).css('cursor','pointer').appendTo(ul_list);
		//为被选中的元素添加class为selected
		if(n==selected_index){
			tag_option.attr('class','selected');
		}
	}
}
})(jQuery)
